<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./jquery-3.5.1.min.js"></script>
<style>
    .box{width: 100px;height: 100px;
    background:blue;position: relative;
    font-size: 12px;
    }
</style>
</head>
<body>
    <input type="button" value="开始">
    <div class="box">内容</div>
    <script>
        $(function(){
            $("input[value='开始']").on("click",function(){
                $(".box").animate({
                    left:"200px",
                    width:"200px",
                    height:"200px",
                    fontSize:"32px"
                })
            })
        })
    </script>
</body>
</html>